The Ohio Democrat. (Logan, O. [Ohio]) 1886-1906, 1887-08-20
SCIENCE AND INDUSTRY.
There are $iOO, 900. 900 invested d II
HIN xxtal alx.ls L.

-
There are $iOo, 900, 900 invested d in
the watch industry in this country.
The canning and evaporating busi-
ness Is rapidly extending in the South.
The eggs of single sturgeon,
counted by Frank Buckland, numbered
921. 600 and weighed forty-iive pounds.
--Arkansaw Traveller.
Photographs of the interior OF the
living eye were exhibited recently at a
meeting Of the Canadian Institute by
DIR. Roscbough, of Toronto. One OF
them showed upon the retina the in
verted picture of the objects at which
the eye was looking.
"A French Psychologist has been
cndeavoring by experiment TO gain
light as to the effect of baths upon the
system. He finds that cold baths in
crease the demand of the system for
oxygen, and so affect the action of the
lungs as to double or treble the quantity
Of air passing through them in given
time.-M. Y. Ledger.
"A novel aid to instantaneous photog-
raphy has been devised by two Berlin
chemists. 1t consists of an explosive
powder made of pulverized magnesium,
chlorate of potash and sulphde of anti
mony. When this is ignited it will
illuminate the darkest room with
flash lasting only one-fortieth of q
second, but long enough to obtain q
photograph of person or object in the
apartment.
Salt brine is used in Sheffield, Eng.
for hardening steel, says an exchange.
The mixture improves with age and
use. and to such an extent that its value
is largely increased. In some cases
these tanks are fifty years old, and
have value in proportion to their age.
1t appears that the constant dipping of
the hot metal into the same solution al
ters in some way its character. Frl,sb
Leslie's Newspaper.
The manufacture of rubies has
lately reached such perfection that the
artificial product is often more valua-
BILE than the natural stone. The pro-
cess employed is that of NJ Frenzy,
who described it to the Paris Academy
of Science. Discarding method dis
covered by him some years ago, he
now dissolves alumnia in fluoride of
calcium, and obtains red crystals of
alumina, or perfect rubies, which may
be made of large size. e.-Frant Leslie 8
Newspaper.
Starting on DR.. Dawson's assump-
ton that one foot of coal represents
fifty generations of coal plants, and
that each generation took ten years to
mature-a very moderate assumption
and taking the actually measured thick
ness of the coal measures in some 10.
calities at 10000 feet. Prof. Huxley cal.
culates that the time represented by
the coal formation alone would bo
6,000,0 900 years. sufficient to show that
when we come to deal with geological
time the unit of measurement is 1,OOO,-
900 years.
"A curious effect of the earthquake
in the north of Italy and south of
France has recently come to the atten-
ton of medical circles in Paris. A
telegraph operator, who was sending q
message at the time of one of the more
severe shocks, lost his consciousness
and remained insensible for ten min
ules. On recovery he did not experi-
ence any great suffering. but in rhc
course of two months symptoms OF
paralysis Of the arm and face began to
manifest themselves, and his condition
has now become quite serious. 1t is
supposed that he received powerful
shock of earthquake electricity."-
NJ Y LedQer.